Tire-gage.



J. I'. WATERS.

TIRE G AGB. APPLICATION FILED .TUNE 29, 1912.

1,079,965. Patented 1390.2,1913v IUNITED STATES. PATENT oEEioE.

JOHN F. WATERS, F KASAS CITY, MISSOURI. v

. Specication of Letters Patent.

Application filedJ'une 29, 191.2. Serial No. 706,610.

' termining the pressure in pneumatic tires and is designed toprovide animproved gage which avoids the necessity of providing different gagesfor use when the tire is being inflated by a manually operated pump,V orfrom a high pressure air tank, or from a power-driven pump.

A purpose of the invention is to provide a gage which may be used withany of the different devices for intlating the tire or independent-ly ofan inflating device.

The invention consists in the several novel features hereinafter setforth and more particularly defined byclaims at the concluslon4 hereof.

In the drawings: Figure 1 is a central section of the improved gageapplied toA a pneumatic tirev and with a hose-connection for ahigh-pressure or storage tank. Fig. 2 is a similar view illustrating themanner of connecting the gage to a power pump to indicate the pressureof air being forced to a. tire. Fig. 3 is a section taken on line 3 3'of'Fig. 1. i

The improved gage comprises a body 10 having a longitudinally extendingpistonchamber 11 therein, below which is formed a chamber 12. The bodyis/also provided with a laterally extending nipple 13 which communicateswith chamber 12, by an inletpassage 14. A check-valve lofthe type whichis usually employed in tire-valves, is

inserted in nipple 13 to hold the air in chamber 12 and to prevent backpassage or escape through said nipple. This nipple has its outer endscrew threaded, as at 17, whereby one end of a cock 18 may be secured tosaid nipple. The other end of the `cock is provided with a nippleadapted to be inserted in the end of a hose 20 which may be connected toa manually operated pump or a high pressuretank, (not shown).

The lower end of body 10 is open and is provided with an exteriorscrew-thread 21 for a cap 22 which is adapted to secure an elastic ring23 at the lower end of said body,

a washer being interposed between the` elastic ring and the lower end ofthe body.

This elastic ring is provided with a central y opening which is normallysmaller than the' valve casing of a pneumatic-tire, so that when forcedover said casing, it will form an air-tight connection, which willprevent the air in chamber 12 fromlescaping. This construction providessimple means fo-r conf. necting the body of a gage to a tire which maybe applied by merely forcing the elasticring around the valve-casing.

A cup-shaped piston 27 is secured to thel lower end o-f its stem 28, bywashers 29 and 30 between which said piston is held by a screw 32 whichalso secures the washers at Patenteaneea, 1913.

the lower end of the stem. The upper portion of this stem is guided inan opening 33 formed in the top of the casing and a spring 34 isinterposed between the top -of the casing and the piston 27, so thepressure of air in the receiving-chamber 12 will shift the.

piston and stem against theforce of said spring according to thepressure in said chamber. A groove 48 is formed in the outer end of stem28 and a stopring 49 is held in said groove, to Vlimit the movement ofthe piston 27 by spring 34.

. The piston-stem 28 is substantially trianguiar in the cross-section sothat it will have at least two .faces which are in angular relatio-n toeach other and both of which will be visible from one` view-point. Ascale 38 is marked on one of the angularvfaces to indicate the pressurein pounds per square inch in the body of the gage and in thetire,

and the other face 39 has a scale markedv thereon for indicating thedifferentv sizes of tires, so that the indications of the pres`sure-scale when read inv connection with these sizes, will indicate theproper pressure for the different sizes of tires. That is when `thepressure' is sufficient for example, for av four-inch tire, the twoscales will simultaneously indicate the four-inch tire proper pressurefor such a tire. It is" important that pneumatic tires should besuficiently inilatedand not over inflated and by providing associatedscales on the plunger stem, one for indicating the pressure in the tireand the other for the different sizes of tires, the operator can readilysee vwhen the Itires of diHerent sizes are properly inflated'.

The lower portion of the bore in body 10 is provided with an internalscrewthread 45, whereby, when the 'elastic ring and cap have beenremoved, the gage may be directly connected to a tire-pump to indicatethe and the. l

' pressure of air being supplied to the tire, as

l valve in the tire and hold it shown in Fig. 2.

A perforated plate 40 is sea-ted against'a shoulder 41 and carries astem 42 which is the 'stem and plate-can be removed from the body. -Thebody -isprovided With av hexagonalportion 44 Whereby a Wrench may beapplied'to screw the bo-dy firmly into-conneeted relation with the powerpump.

When the gage is being used, vas shown in Fig'. 1, and the hose' 20 isconnected to a pressure-tank, itis only necessary to open coc-k 18 untilthe size of t-he tire and desired pressure arel indicated onthescales'38, 39, on piston stem 28. 'Vilh'en the desired pressureis'reached, the cock may be closed and the hose disconnected from thetank, or the:

body 1Q may be pulled aivay from the valve-Y casing of the pneumatictire, to permit'the check-valve inthe tire to'close. By employing thecock Which is connectedto. the body of the gage, Athe pressure from tankor power pump ma'y be controlled to a nicety. When the improved gage isto be app-lied to a power-pump as -shoWn inv Fig..2, checkvalve -15 isremoved from nipple 13 so that `air can pass out through said nipple,and cap 22, Washer 24,felastic'ring 23, and plate 4 0 With its stem 42are removed from body 10. The gage is then placed lover the usualoutlet-nipple 46 of a pump 47, and then lturned to" cause screw-threadto engage the 'screw-thread on said nipple,- to t-he positionshown inFig.'2. The improved gage, Whenthus applied, Will serve to indi'catethepressu're'in't-he line to the tire so'thata.

Y reading may be taken at the. pump instead ofv at the tire,^`When-thegage is connected to'a power pump. The-invention thus provides agage'which is adapted to be used. in all the dii'erent places Where sucha Adevice is desired, without providing special devices for eachdifferent place of use.

This plate and stem are reably held in said body, and an internal vscrew-thread in the body below the pistonchamber-'for .securing thevbody to a scrcwthread. on' a power-pump.-

2. In a tire-gage, the combination .ot-a body having a piston-chambertherein, a piston mounted to slide 1n said chamber, a 'springfor-resisting movement of the piston, a nipple connected to one side ofthe body at an angle the-reto, a cock connected tothe outer end of saidnipple and havlng means for connection to a-hose from an air-supply,means providing a removable elastic ring for connecting said body'to atire-val.ve, a perforated plate carrynlg a stem for releasing thecheck-valve in atire removably heldin said body and an internalscrew-thread in the body below the piston-chamber and "said plate fordetaehably 'securing said body to a-sc'rew-thread on a power pump whensaid plate and ring have been removed;

3. In a tire-gage, the combination .of a body, having a. piston-chambertherein, a

piston mounted to slide in said chamber,

a spring for resisting movement of the piston,y a nipple connected to'one Side of the' body, a check-valve removably held insaid nipple, anelastic ringremovably -hcld on the lower end of said body, a device forre-A leasing the check-valve in a tire, removably held in said body, andmeans in the body body to apower-pump.

below the piston-chamber for securing the' Witnesses:

v N. TAYLOR,

Gn H. WERnms.

